This book presents a detailed study of unusual firearms, with the goal of helping forensic analysts and crime scene investigators minimize erroneous conclusions in cases where nonstandard firearms are used. Providing concise yet complete techniques for making forensic conclusions, the book begins with an introduction to unusual firearms and proceeds to discuss forensic investigation of fired bullets, medico-legal evidence, barrel marks on fired shots, and investigation of fired cartridges and shot charge. The book also covers timing of firing, unusual rifling marks, and shooter identification.